为什么我不能在params中做每一个？

Question

I have this inputs

<input type="hidden" name="languages[0][name]" value="xx">
<input type="hidden" name="languages[0][level]" value="yy">

0 is a value thats change as this inputs are generated dynamically with javascript.

In my controller, I want access to this parameters, and do each, like this:

params[:languages].each do |lang|
    @job_offer.job_offer_languages.create name: lang[:name], level: lang[:level]
  end
end

params[:languages] is :

{"0"=><ActionController::Parameters {"name"=>"Inglés", "level"=>"Bás̄ico"} permitted: false>} permitted: false>

So I'm expecting each to give me a hash with name and level,

But in the each lang is the key "0" as an string, not the parameters.

I've tried with fetch and permit, got the same results.

The only way I made it works is adding this as the first line in the each, but I don't understand why I have to do it.

 ...each do |lang|
        lang = params[:languages].fetch(lang)

Answer 1

Because your params[:language] is a hash each iterates over its entries and passes key and value of each entry to a block. Therefore, to access lang the way you want you need to the following:

params[:languages].each do |index, lang|
    @job_offer.job_offer_languages.create name: lang[:name], level: lang[:level]
  end
end

or use ActiveSupport to receive list of lang values to iterate over:

 params[:languages].values.each do |lang|
    @job_offer.job_offer_languages.create name: lang[:name], level: lang[:level]
  end
end